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Detection and identification of Amylostereum areolatum (Russulales: Amylostereaceae) in the mycangia of Sirex nigricornis (Hymenoptera: Siricaidae) in central LouisianaAuthor(s): Rabiu Olatinwo; Jeremy Allison; James Meeker; Wood Johnson; Douglas Streett; M. Catherine Aime; Christopher Carlton
Source: Environmental Entomology
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
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DescriptionThe woodwasp Sirex noctilio F. (Hymenoptera: Siricidae) has become established in North America. A primary tactic for the management of S. noctilio in the southern hemisphere has been the development of a biological control agent, Deladenus siricidicola Bedding. This nematode has a bicyclic life cycle including a mycetophagous free-living and parasitic cycle. During oviposition, female Sirex woodwasps inject a symbiotic fungus. Because D. siricidicola only develops well on Amylostereum areolatum (Chaillet ex Fries) Boidin (Russulales: Amylostereaceae) and North American woodwasps were thought to all have Amylostereum chailletii (Persoon) Boidin as their fungal symbiont, the risk of unintended impacts from D. siricidicola in North America was considered low. Specific polymerase chain reaction primers were designed to amplify the intergenic spacer region of Amylostereum symbionts in a population of the native woodwasp Sirex nigricornis F. located in central Louisiana (i.e., well outside the known distribution of S. noctilio); identity of the symbiont was confirmed by phylogenetic analyses. Overall, 95 out of 100 fungal isolates obtained from the mycangia of S. nigricornis were identified as Amylostereum species. Contrary to expectations, 60% were identified as A. chailletii (N 60), while 35% were identified as A. areolatum (N 35). The remaining 5% of these isolates (N 5) were identified as Bipolaris papendorfii (Aa) Alcorn, Alternaria alternata (Fr.) Keissl, Penicillium marneffei Segretain, Scytalidium cuboideum (Sacc. & Ellis) Sigler & Kang, and Hyphopichia heimii (Pignal) Kurtzman based on sequencing of the internal transcribed spacer (ITS) region. The five non-Amylostereum isolates were likely contaminants during mycangia-spore extraction process. This study confirms the presence of A. areolatum in a population of the native woodwasp S. nigricornis well outside the known distribution of S. noctilio.
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CitationOlatinwo, Rabiu; Allison, Jeremy; Meeker, James; Johnson, Wood; Streett, Douglas; Aime, M. Catherine; Carlton, Christopher. 2013. Detection and identification of Amylostereum areolatum (Russulales: Amylostereaceae) in the mycangia of Sirex nigricornis (Hymenoptera: Siricaidae) in central Louisiana. Environmental Entomology 42(6): 1246-1256.
KeywordsAmylostereum, invasive species, Sirex, symbiont
- Intergenic spacer single nucleotide polymorphisms forg genotyping amylostereum areolatum (Russulales: Amylostereacea) symbionts of native and non-native sirex species
- The influence of Amylostereum areolatum diversity and competitive interations on the fitness of the Sirex parasitic nematode Deladenus siricidicola
- Efficacy of Kamona strain Deladenus siricidicola nematodes for biological control of Sirex noctilio in North America and hybridisation with invasive conspecifics
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